CN101583205A - Method for measuring TD-SCDMA inter-cells by using two-mode or multi-mode terminal - Google Patents
Method for measuring TD-SCDMA inter-cells by using two-mode or multi-mode terminal Download PDFInfo
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- CN101583205A CN101583205A CNA2008100375581A CN200810037558A CN101583205A CN 101583205 A CN101583205 A CN 101583205A CN A2008100375581 A CNA2008100375581 A CN A2008100375581A CN 200810037558 A CN200810037558 A CN 200810037558A CN 101583205 A CN101583205 A CN 101583205A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a method for measuring TD-SCDMA inter-cells by using a two-mode or multi-mode terminal, which comprises the following steps: firstly, obtaining downlink frame time coarse synchronizing of TD-SCDMA by utilizing an energy window; secondly, measuring receiving signal strength indication of one of downlink pilot frequency time slot or TS0 time slot in a TD-SCDMA frame, reporting the indication to a higher layer protocol to be used as the basis of performing the mode switching, and maintaining the coarse synchronizing to the TD-SCDMA; thirdly, judging whether the coarse synchronizing is reliable or not, if yes, circulating in the measurement and the maintenance of the coarse synchronizing, or else, performing the coarse synchronizing again. The method can avoid the blind detection to a downlink synchronous code and a base intermediate code and reduces the calculated amount of a receiver, thereby lowering the power consumption and prolonging the stand-by time of the terminal.
Description
Technical field
The present invention relates to the dual-mode/multi-mode terminal and measure TD-SCDMA adjacent area technical field, particularly at the method that needs to measure the TD-SCDMA adjacent area under other non-TD-SCDMA patterns.
Background technology
The physical channel of TD-SCDMA system adopts four-layer structure: system-frame, radio frames, subframe and time slot/sign indicating number.
As shown in Figure 1, it illustrates the frame structure schematic diagram of TD-SCDMA system.This structure is to provide in low spreading rate time division duplex (LCR-TDD) pattern (1.28Mcps) in 3G collaborative project (3GPP) standard TS 25.221.The spreading rate of TD-SCDMA system is 1.28Mcps, and the length of each radio frames (Radio Frame) 100 is 10ms, is divided into two subframes 101 that structure is identical
0, 101
1(101), the length of each subframe is 5ms, just comprises 6400 chips.
Wherein, the subframe 101 in each TD-SCDMA system can be divided into 7 time slots again (TS0～TS6) 102
0-102
6(102), descending pilot frequency time slot (DwPTS) 103 and uplink pilot time slot (UpPTS) 105, and protection interval (Guard) 104.TS0 time slot 102
0Be used to bearing system broadcast channel and other possible downlink traffic channel, TS0 contains beacon channel, can be used for measuring the signal strength signal intensity of sub-district.TS1 must carry uplink service, and TS2～TS6 time slot 102
1-102
6Then be used to carry the uplink and downlink Traffic Channel, but must between TS1 and transfer point (Switching Point) 112, do uplink service, behind transfer point 112, do downlink business by demand.It is synchronous that uplink pilot time slot (UpPTS) 105 and descending pilot frequency time slot (DwPTS) 103 are used to set up initial uplink and downlink respectively.TS0～TS6 time slot 102
0-102
6Length is 0.675ms or 864 chips, wherein comprise data segment Data Part1 (108) and Data Part2 (110) that two segment lengths are 352 chips, and a middle segment length is the training sequence of 144 chips---intermediate code (Midamble) sequence 109.Midamble sequence 109 is significant at TD-SCDMA, comprise that modules such as cell ID, channel estimating and measurement all will use it, it is generated according to 3G collaborative project (3GPP) standard TS 25.221 by basic midamble code (Basic Midamble) code word 114, has 128 basic midamble codes in the TD-SCDMA system at most.The protection that DwPTS time slot 103 comprises 32 chips at interval 111 and one long be descending synchronous code (SYNC-DL) code word 106 of 64 chips, its effect is cell ID and sets up initial synchronisation, 32 different descending synchronous code code words 106 are arranged in the TD-SCDMA system, and each descending synchronous code code word 106 can corresponding 4 basic midamble codes; And the UpPTS time slot comprise one long be uplink synchronous code (SYNC-UL) code word 107 of 128 chips, subscriber terminal equipment utilizes it to carry out relevant up access procedure.The cell ID of TD-SCDMA identifies by basic midamble code's code word.
From Fig. 1 as seen, the GP of 32 chips is arranged in the front of descending synchronous code 106, there is the GP of 96 chips the back.Therefore, in downstream signal, can there be the low-power signal of 32 chips in descending synchronous code (SYNC-DL) 106 front and back; And all there is not this characteristic in other parts in frame signal.Therefore, in existing system, can utilize this characteristic, make receiver under the situation of not knowing descending synchronous code (SYNC-DL) 106 concrete which SYNC-DL code word of use, just can detect descending pilot frequency time slot 103, and then obtain to judge the original position of frame in the downstream signal roughly, that is obtained the rough time synchronized of downlink frame.These class methods are called as utilization " energy window " and obtain downlink synchronizing method.
Certainly, also may use other energy windows in the TD-SCDMA frame signal.The low-yield CP 113 of 16 chips that for example, occur behind each time slot in the detection signal.This characteristic occurs repeatedly in signal, after detecting, and then can obtain the position of common time slot, thereby obtains frame synchronization.
The general process of measurement TD-SCDMA adjacent area comprises the steps: as shown in Figure 2 under other non-TD-SCDMA patterns
Step 201: it is temporal synchronously thick to obtain downlink frame.Utilize above-mentioned energy window, obtain the rough time synchronized of TD-SCDMA downlink frame signal.
Step 202: descending synchronous code confirms that it is synchronously smart to obtain present frame time.32 descending synchronous code code words of operating specification regulation detect descending pilot frequency time slot 103 respectively, confirm the employed descending synchronous code code word of descending pilot frequency time slot.After detecting the code word of concrete use, and then the essence that has just obtained on the downlink frame signal time is synchronous.
Step 203: basic midamble code's code word is determined.Utilize detected each descending synchronous code code word, determine its pairing 4 basic midamble code's code words according to standard; Use this 4 code words respectively, to the TS0 time slot 102 that receives
0Middle intermediate code signal detects, and determines basic midamble code's code word of the actual use of each descending synchronous code code word.
Step 204: channel estimating and measurement.With the definite basic midamble code's code word of step 203, signal on the TD-SCDMA TS0 that receives is carried out channel estimating, and according to the received signal chip intensity (RSCP) of the outcome measurement TD-SCDMA sub-district of channel estimating, and this measurement result reported upper-layer protocol, as the foundation of whether carrying out mode switch.
Step 205: judge whether to need to detect new sub-district.If then execution in step 202; If not, then execution in step 204, promptly keep previous detected cell measurement.
In step 205, during to new cell measurement, do not return step 201, promptly obtain the synchronously thick of downstream signal again, its reason is, each base station is the synchronized transmissions signal in the existing TD-SCDMA system, therefore in case obtained a base station downlink frame thick synchronously after, the relative time delay of other base station down signals and this base station down signal is little, and then acquired thick synchronization accuracy can satisfy.Therefore, can omit step 201.
If terminal in the system message of non-TD-SCDMA pattern or TD-SCDMA pattern, has been learnt the basic midamble code of TD-SCDMA adjacent area, then basic midamble code's code word determining step 203 can be omitted.Simultaneously, because known employed basic midamble code also just can determine the employed descending synchronous code in sub-district.At this moment, in step 202, descending synchronous code is confirmed not use 32 code words to go respectively descending pilot frequency time slot 103 to be detected, and only is to use the sign indicating number that is disposed to detect just passable.
Therefore,, then need in 32 descending synchronous codes, detect, also will in 4 descending basic midamble codes, detect if terminal is not known TD-SCDMA basic midamble code that use the adjacent area.And if terminal is when knowing this configuration, it is original 1/32nd that the amount of calculation of step 202 can be reduced at most, and the calculating of step 203 can be omitted.
But, in existing system, there is following problem:
One, in the broadcast of non-TD-MBMS system, possible configuration also may not dispose the employed basic midamble code in TD-MBMS adjacent area.When the latter occurs, this just require terminal will be in 32 descending synchronous codes and 4 basic midamble codes blind Detecting, amount of calculation improves greatly.And then strengthened processing delay, improved power consumption.
Two, when blind detection process occurs, because the mobile reason of terminal, determine the process need repetition frequently of descending synchronous code code word and basic midamble code's code word, if the interval of repeating is too big, so just may cause time delay for switching to increase even call drop because not finding new TD-SCDMA sub-district (having different basic midamble code's code words) timely.
Therefore, need to seek a kind of acquisition TD-SCDMA cell downlink of avoiding blind Detecting synchronously and the method for measuring, its synchronously and measurement performance can satisfy under the prerequisite of system requirements, avoid blind Detecting.
Summary of the invention
The objective of the invention is to, under the prerequisite that synchronous and measurement performance can meet the demands, provide a kind of dual-mode/multi-mode terminal to measure the method for TD-SCDMA adjacent area, can avoid blind Detecting to descending synchronous code and basic midamble code, and then the amount of calculation of reduction receiver, thereby the reduction power consumption, the stand-by time of prolongation terminal.
The present invention proposes the method that a kind of dual-mode/multi-mode terminal is measured the TD-SCDMA adjacent area, may further comprise the steps:
A. utilize the downlink frame time of energy window acquisition TD-SCDMA slightly synchronous;
B. measure the received signal intensity indication of one of descending pilot frequency time slot in the TD-SCDMA frame or TS0 time slot, and report upper-layer protocol as the foundation of carrying out mode switch;
C. keep to TD-SCDMA thick synchronously;
D. judge whether this is slightly reliable synchronously,, then return step b if reliable; Otherwise, return step a.
In above-mentioned steps d; judge slightly whether reliable method can comprise synchronously for this: utilize the signal power sum of the signal power of the descending synchronous code in the descending pilot frequency time slot divided by the protection interval chip of the forward and backward certain-length of down-going synchronous chip; when this ratio during greater than default thresholding; judging should be thick reliable synchronously; otherwise, judge that this is slightly unreliable synchronously.
In above-mentioned steps d, the forward and backward protection gap length of this down-going synchronous chip is all got 32 chips.
In above-mentioned steps d, the forward and backward protection gap length of this down-going synchronous chip is all less than 32 chips.
In above-mentioned method, between step a and b, also can comprise step: confirm the employed descending synchronous code of descending pilot frequency time slot, and it is synchronously smart to obtain the present frame time.
In above-mentioned method, confirm that the step of the employed descending synchronous code of descending pilot frequency time slot comprises: 32 descending synchronous codes of operating specification regulation detect descending pilot frequency time slot respectively, detect the employed descending synchronous code of descending pilot frequency time slot.
In above-mentioned method, judge slightly whether reliable method can also comprise synchronously for this: the descending synchronous code of confirming is correlated with to the descending pilot frequency time slot that receives, the ratio of the energy around the relevant peaks is judged this thick synchronous reliability according to correlation peak or relevant peaks energy.
Therefore, compare with general measurement TD-SCDMA adjacent area process, the present invention needs only the simple thick synchronizing process of safeguarding the TD-SCDMA sub-district, and replaces measuring received signal chip intensity (RSCP) in the prior art with measuring received signal intensity indication (RSSI).The present invention has omitted TD-SCDMA sub-district basic midamble code code word fully and has confirmed process and channel estimation process, reduce even omitted the searching times of community downlink synchronous code code word according to performance requirement, reduced under other patterns the power consumption and the mode switch delay problem that bring when the TD-SCDMA adjacent area measured significantly.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the frame structure of TD-SCDMA system.
Fig. 2 illustrates and obtains the process that the TD-SCDMA sub-district is synchronous and measure in the prior art.
Fig. 3 illustrates and obtains the process that the TD-SCDMA sub-district is synchronous and measure according to an embodiment of the invention.
Fig. 4 illustrates and obtains the process that the TD-SCDMA sub-district is synchronous and measure in accordance with another embodiment of the present invention.
Embodiment
The method that terminal of the present invention is measured the TD-SCDMA adjacent area is applicable to that bimodulus or multimode terminal measure the adjacent sub-district of the TD-SCDMA row mode of going forward side by side and switch (as switching to TD-SCDMA from GSM).
The process of measuring the TD-SCDMA adjacent area according to an embodiment of the invention as shown in Figure 3.If the GSM/TD-SCDMA dual-mode terminal is under the GSM pattern, when GSM has to TD-SCDMA adjacent area frequency point information from broadcast message after, when measuring the TD-SCDMA signal, needs need carry out following process:
At first in step 301, it is slightly synchronous to obtain the downlink frame time.Terminal is utilized energy window after getting access to the adjacent subdistrict frequency point information of TD-SCDMA, obtain the rough time synchronized of TD-SCDMA downlink frame signal.
Enter step 302 then, confirm descending synchronous code, and it is synchronously smart to obtain the present frame time.Wherein, 32 descending synchronous codes (SYNC-DL) code word of operating specification regulation detects descending pilot frequency time slot (DwPTS) 103 (Fig. 1) respectively, confirms the employed descending synchronous code code word of descending pilot frequency time slot.After detecting the code word of concrete use, and then the essence that has just obtained on the downlink frame signal time is synchronous.
Execution in step 303 afterwards, begin to measure the received signal intensity indication (RSSI) of TS0 or the descending pilot frequency time slot (DwPTS) of TD-SCDMA, just calculate the mean value of the energy of received signal, and this measurement result is reported upper-layer protocol, as the foundation of whether carrying out mode switch.
Enter step 304 afterwards, in the scope that performance allows, terminal is kept synchronously thick to TD-SCDMA.
In step 305, judge thick synchronous reliability.If slightly be reliably synchronously, then, promptly return step 303 always at this measurement/thick synchronous ring maintenance process; If thick synchronous result is unreliable, then return step 301.
In step 305, can utilize the energy response of DwPTS window to judge for thick synchronous reliability: with reference to shown in Figure 1, with the signal power of the descending synchronous code 106 in the middle of the energy window divided by the forward and backward protection of the descending synchronous code 106 power sum of GP 111 and 104 certain-length chip at interval, wherein chip lengths can all be got 32 chips that equal GP 111, also can be less than 32 chips; The ratio of above-mentioned power has reacted thick synchronous reliability, and poor more synchronously, this ratio can be more little; Therefore, if this ratio greater than default thresholding, then thinks reliable; Otherwise, think unreliable.
In addition, in step 305, can be correlated with to the descending pilot frequency time slot signal that receives, the ratio of the energy around the relevant peaks be judged as thick synchronous reliability according to correlation peak or relevant peaks energy with the descending synchronous code that step 302 obtains.
Fig. 4 illustrates and obtains the process that the TD-SCDMA sub-district is synchronous and measure in accordance with another embodiment of the present invention.Compare with embodiment illustrated in fig. 3, present embodiment can omit the step of wherein confirming descending synchronous code 106 according to performance need.The process of present embodiment is as follows:
At first in step 401, it is slightly synchronous to obtain the downlink frame time.Terminal is utilized energy window after getting access to the adjacent subdistrict frequency point information of TD-SCDMA, obtain the rough time synchronized of TD-SCDMA downlink frame signal.
Execution in step 402 afterwards, begin to measure the received signal intensity indication (RSSI) of TS0 or the descending pilot frequency time slot (DwPTS) of TD-SCDMA, just calculate the mean value of the energy of received signal, and this measurement result is reported upper-layer protocol, as the foundation of whether carrying out mode switch.
Enter step 403 then, in the scope that performance allows, terminal is kept synchronously thick to TD-SCDMA.
In step 404, judge thick synchronous reliability.If slightly be reliably synchronously, then, promptly return step 402 always at this measurement/thick synchronous ring maintenance process; If thick synchronous result is unreliable, then return step 401.
In step 404, can utilize the energy response of DwPTS window to judge for thick synchronous reliability: with reference to shown in Figure 1, with the signal power of the descending synchronous code 106 in the middle of the energy window divided by the forward and backward protection of the descending synchronous code 106 power sum of GP 111 and 104 certain-length chip at interval, wherein chip lengths can all be got 32 chips that equal GP 111, also can be less than 32 chips; If the ratio of above-mentioned power greater than default thresholding, then thinks reliable; Otherwise, think unreliable.
Compare with general measurement TD-SCDMA adjacent area process, the present invention needs only the simple thick synchronizing process of safeguarding the TD-SCDMA sub-district, and replaces measure R SCP with measuring received signal intensity indication (RSSI).The present invention has omitted TD-SCDMA sub-district basic midamble code code word fully and has confirmed process and channel estimation process, reduce even omitted the searching times of community downlink synchronous code code word according to performance requirement, reduced under other patterns the power consumption and the mode switch delay problem that bring when the TD-SCDMA adjacent area measured significantly.
But in the TD-SCDMA adjacent area for have only a sub-district under certain frequency or have the strongest sub-district of a plurality of sub-districts signal strength signal intensity than other sub-districts the high 6db of signal strength signal intensity when above, the measurement result of the precision of so this measurement and general measurement TD-SCDMA adjacent area process is similar to.Configuration and optimization by general networking can be avoided having the close sub-district of a plurality of intensity under the same frequency, thereby avoid making above-mentioned measurement result error to occur.
Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of claims of the present invention change and modification, all should be technology category of the present invention.
Claims (7)
1, a kind of bimodulus or multimode terminal are measured the method for TD-SCDMA adjacent area, may further comprise the steps:
A. utilize the downlink frame time of energy window acquisition TD-SCDMA slightly synchronous;
B. measure the received signal intensity indication of one of descending pilot frequency time slot in the TD-SCDMA frame or TSO time slot, and report upper-layer protocol as the foundation of carrying out mode switch;
C. keep to TD-SCDMA thick synchronously;
D. judge whether this is slightly reliable synchronously,, then return step b if reliable; Otherwise, return step a.
2, bimodulus as claimed in claim 1 or multimode terminal are measured the method for TD-SCDMA adjacent area; it is characterized in that; in steps d; judge slightly whether reliable method comprises synchronously for this: utilize the signal power sum of the signal power of the descending synchronous code in the descending pilot frequency time slot divided by the forward and backward certain-length protection interval chip of down-going synchronous chip; when this ratio during greater than default thresholding; judging should be thick reliable synchronously, otherwise, judge that this is slightly unreliable synchronously.
3, bimodulus as claimed in claim 2 or multimode terminal are measured the method for TD-SCDMA adjacent area, it is characterized in that the forward and backward protection gap length of this down-going synchronous chip is all got 32 chips.
4, bimodulus as claimed in claim 2 or multimode terminal are measured the method for TD-SCDMA adjacent area, it is characterized in that, the forward and backward protection gap length of this down-going synchronous chip is all less than 32 chips.
5, bimodulus as claimed in claim 1 or multimode terminal are measured the method for TD-SCDMA adjacent area, it is characterized in that, also comprise step between step a and b:
A1. confirm the employed descending synchronous code of descending pilot frequency time slot, and it is synchronously smart to obtain the present frame time.
6, bimodulus as claimed in claim 5 or multimode terminal are measured the method for TD-SCDMA adjacent area; it is characterized in that; the step of confirming the employed descending synchronous code of descending pilot frequency time slot comprises: 32 descending synchronous codes of operating specification regulation detect descending pilot frequency time slot respectively, detect the employed descending synchronous code of descending pilot frequency time slot.
7, bimodulus as claimed in claim 5 or multimode terminal are measured the method for TD-SCDMA adjacent area; it is characterized in that; in steps d; judge slightly whether reliable method comprises synchronously for this: the descending synchronous code of confirming is correlated with to the descending pilot frequency time slot that receives, the ratio of the energy around the relevant peaks is judged this thick synchronous reliability according to correlation peak or relevant peaks energy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100375581A CN101583205A (en) | 2008-05-16 | 2008-05-16 | Method for measuring TD-SCDMA inter-cells by using two-mode or multi-mode terminal |
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|---|---|---|---|
| CNA2008100375581A CN101583205A (en) | 2008-05-16 | 2008-05-16 | Method for measuring TD-SCDMA inter-cells by using two-mode or multi-mode terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103228006A (en) * | 2013-05-20 | 2013-07-31 | 苏州维特比信息技术有限公司 | Multimode wireless terminal |
| WO2014183509A1 (en) * | 2013-11-28 | 2014-11-20 | 中兴通讯股份有限公司 | Communication terminal management method and communication system |
-
2008
- 2008-05-16 CN CNA2008100375581A patent/CN101583205A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103228006A (en) * | 2013-05-20 | 2013-07-31 | 苏州维特比信息技术有限公司 | Multimode wireless terminal |
| CN103228006B (en) * | 2013-05-20 | 2016-05-11 | 李文龙 | A kind of multi-module radio terminal |
| WO2014183509A1 (en) * | 2013-11-28 | 2014-11-20 | 中兴通讯股份有限公司 | Communication terminal management method and communication system |
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Application publication date: 20091118 |